Abstract: A helmet sizing assembly for adjusting the size of a helmet includes a plurality of helmet liners that each has a dome shape to conform to an inside of a helmet. The plurality of helmet liners has a sequentially increasing size ranging between a minimum size and a maximum size. In this way a selected number of the plurality of helmet liners can be stacked inside each other to accommodate a variety of head sizes. Each of the helmet liners is comprised of a resiliently compressible material to facilitate the user's head to be protected from impact energy when the user wears the helmet.

Abstract: A helmet locking assembly for securely storing motorcycle helmets on a motorcycle includes a mounting unit that is coupled to a motorcycle. A pair of locking units is each coupled to the mounting unit. Each of the locking units releasably engages a respective one of a plurality of motorcycle helmets for retaining the motorcycle helmets on the motorcycle. A pair of turn signals is coupled to the mounting unit. Each of the turn signals is turned on when respective ones of the motorcycle turn indicators is turned on. A plurality of light emitters is coupled to the mounting unit. Each of the light emitters is turned on when tail lights or brake lights of the motorcycle are turned on.

Abstract: A motorcycle accessory mounting system for conveniently riding with beverages and a cellphone includes a cellphone mount apparatus and a beverage mount apparatus. The cellphone mount apparatus comprises a cellphone clamp to selectively engage a handlebar of a motorcycle. A cellphone holder back is coupled to a cellphone rod. A pair of cellphone holder sides is coupled to the cellphone holder back and to selectively engage a cellphone. The beverage mount apparatus comprises a beverage clamp to selectively engage the handlebar. A beverage holder is coupled to a beverage rod and has a cup bottom, a cup sidewall coupled to the cup bottom, and an open cup top side. The beverage holder serves as a cup holder to receive a cup conforming to the cup sidewall. A lid and a straw are engageable with the open cup top side.

Abstract: A motorcycle accessory mounting system for conveniently riding with beverages and a cellphone includes a cellphone mount apparatus and a beverage mount apparatus. The cellphone mount apparatus comprises a cellphone clamp to selectively engage a handlebar of a motorcycle. A cellphone holder back is coupled to a cellphone rod. A pair of cellphone holder sides is coupled to the cellphone holder back and to selectively engage a cellphone. The beverage mount apparatus comprises a beverage clamp to selectively engage the handlebar. A beverage holder is coupled to a beverage rod and has a cup bottom, a cup sidewall coupled to the cup bottom, and an open cup top side. The beverage holder serves as a cup holder to receive a cup conforming to the cup sidewall. A lid and a straw are engageable with the open cup top side.

Abstract: A helmet locking assembly for securely storing motorcycle helmets on a motorcycle includes a mounting unit that is coupled to a motorcycle. A pair of locking units is each coupled to the mounting unit. Each of the locking units releasably engages a respective one of a plurality of motorcycle helmets for retaining the motorcycle helmets on the motorcycle. A pair of turn signals is coupled to the mounting unit. Each of the turn signals is turned on when respective ones of the motorcycle turn indicators is turned on. A plurality of light emitters is coupled to the mounting unit. Each of the light emitters is turned on when tail lights or brake lights of the motorcycle are turned on.